Huge lag caused by switch from GPU 1 (Nvidia) to GPU 0 (Integrated Intel) intermittently in game

Age of Empires II: DE II - Report a Bug
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Yeah I can confirm this problem occurs to me too. Thanks to @thieftdp8498 for letting me know that there are other people with the same problem.
Here’s the link to my report: UI vanishes when using mods for prolonged time period